Predicted EUI/FSI 174 Å response to a non-thermal beam of electrons whose impact on the solar atmosphere was modelled by 1D RADYN simulations. Panel a) shows the predicted EUI/FSI 174 Å flux integrated over the entire loop. At the time of the short-exposure observations, the integrated 174 Å flux is ∼68 000 DN/s/pix, which is remarkably consistent with the peak rate observed, which reaches ∼74 000 DN/s/pix. Panel b) also shows the response as a function of height in the chromosphere, between 0.8 and 1.5 Mm above the photosphere. The data has been clipped to a maximum of 6000 DN/s/pix in order to increase image contrast for display purposes.